1T0N

Conformational switch in polymorphic H-2K molecules containing an HSV peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.230 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The structure of H-2K(b) and K(bm8) complexed to a herpes simplex virus determinant: evidence for a conformational switch that governs T cell repertoire selection and viral resistance

Webb, A.I.Borg, N.A.Dunstone, M.A.Kjer-Nielsen, L.Beddoe, T.McCluskey, J.Carbone, F.R.Bottomley, S.P.Aguilar, M.I.Purcell, A.W.Rossjohn, J.

(2004) J.Immunol. 173: 402-409

  • Primary Citation of Related Structures:  1T0M

  • PubMed Abstract: 
  • Polymorphism within the MHC not only affects peptide specificity but also has a critical influence on the T cell repertoire; for example, the CD8 T cell response toward an immunodominant HSV glycoprotein B peptide is more diverse and of higher avidit ...

    Polymorphism within the MHC not only affects peptide specificity but also has a critical influence on the T cell repertoire; for example, the CD8 T cell response toward an immunodominant HSV glycoprotein B peptide is more diverse and of higher avidity in H-2(bm8) compared with H-2(b) mice. We have examined the basis for the selection of these distinct antiviral T cell repertoires by comparing the high-resolution structures of K(b) and K(bm8), in complex with cognate peptide Ag. Although K(b) and K(bm8) differ by four residues within the Ag-binding cleft, the most striking difference in the two structures was the disparate conformation adopted by the shared residue, Arg(62). The altered dynamics of Arg(62), coupled with a small rigid-body movement in the alpha(1) helix encompassing this residue, correlated with biased Valpha usage in the B6 mice. Moreover, an analysis of all known TCR/MHC complexes reveals that Arg(62) invariably interacts with the TCR CDR1alpha loop. Accordingly, Arg(62) appears to function as a conformational switch that may govern T cell selection and protective immunity.


    Organizational Affiliation

    Protein Crystallography Unit, Department of Biochemistry and Molecular Biology, School of Biomedical Sciences, Monash University, Clayton, Victoria 3800, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
H-2 class I histocompatibility antigen, K-B alpha chain
A, D
278Mus musculusGene Names: H2-K1 (H2-K)
Find proteins for P01901 (Mus musculus)
Go to UniProtKB:  P01901
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Beta-2-microglobulin
B, E
99Mus musculusGene Names: B2m
Find proteins for P01887 (Mus musculus)
Go to UniProtKB:  P01887
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Glycoprotein B
P, Q
8Human herpesvirus 1 (strain F)Gene Names: gB
Find proteins for P06436 (Human herpesvirus 1 (strain F))
Go to UniProtKB:  P06436
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.230 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 66.280α = 90.00
b = 90.230β = 111.50
c = 89.150γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
CNSrefinement
SCALEPACKdata scaling
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-11-23
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance